I was interested in Roto-Gro's a while back but after I did alot of research on them I don't think they are worth the time and money. The number one problem I see with them are the numbers of plants you have to have. Also the chances for mold are very high because of the higher number of plants. I saw some pictures on another site of some impressive grows and I have heard of really high yields but none of it compares to some of the results I have seen from some people on this site.